railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Soldering and Brazing
A general-purpose solder designated as “60 – 40” means
1
A solder with 60% tin and 40% lead
2
A solder with 40% tin and 60% lead
3
A solder with 60% tin and 40% copper
4
A solder with 40% tin and 60% copper